An Elementary Treatise on Geometrical Optics |
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Page 2
... medium . 3. When the medium is homogeneous , light travels through it in straight lines . This is a law which is being constantly verified by experience . In fact , to test roughly whether a given line is straight or not , it is not ...
... medium . 3. When the medium is homogeneous , light travels through it in straight lines . This is a law which is being constantly verified by experience . In fact , to test roughly whether a given line is straight or not , it is not ...
Page 9
... medium is incident on the surface of another medium , it is usually divided into three separate portions which behave in dif- ferent manners . ( i ) A portion is reflected back into the original me- dium , in a direction determined ...
... medium is incident on the surface of another medium , it is usually divided into three separate portions which behave in dif- ferent manners . ( i ) A portion is reflected back into the original me- dium , in a direction determined ...
Page 15
... medium to another by refraction , the two portions of the ray be- fore and after incidence on the new medium are called the incident and refracted rays ; and the acute angles which they make with the normal to the surface of separation ...
... medium to another by refraction , the two portions of the ray be- fore and after incidence on the new medium are called the incident and refracted rays ; and the acute angles which they make with the normal to the surface of separation ...
Page 16
... medium along the direction of the refracted ray , it will after refraction into the first me- dium retrace the path ... medium of the same nature as that in which it was originally travelling , the initial and final directions of the ray ...
... medium along the direction of the refracted ray , it will after refraction into the first me- dium retrace the path ... medium of the same nature as that in which it was originally travelling , the initial and final directions of the ray ...
Page 18
... medium is incident on a more highly refracting medium , the law of refraction always gives a direction for the refracted ray . But when a given ray is passing from the medium B into the medium A which is less refractive , the angle o ...
... medium is incident on a more highly refracting medium , the law of refraction always gives a direction for the refracted ray . But when a given ray is passing from the medium B into the medium A which is less refractive , the angle o ...
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An Elementary Treatise on Geometrical Optics (Classic Reprint) R. S. Heath No preview available - 2016 |
Common terms and phrases
achromatic angle of incidence aperture apparent magnitude astronomical telescope axis B₁ called caustic centre circle coloured concave concave lens conjugate foci converge convex lens corresponding Crown 8vo denote direction distinct vision Edited emerge parallel emergent ray equal equation extreme pencils eye-glass eye-lens eye-piece field of view final image focal length focal plane glass Hence illuminated inches incident ray inclined infinity instrument k₁ lenses linear magnitudes luminous magnifying power meet nodal points normal object object-glass object-mirror P. G. Tait pair of conjugate perpendicular placed plane mirror point Q position principal focus principal plane principal points prism pupil radii radius ray of light rays diverging reflected rays reflexion refracting surface refractive index respectively retina right angles second medium seen small mirror spectrum sphere spherical surface subtended suppose tangent theorem triangles vertex visual angle
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